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Low voltage tunnel field-effect transistor (TFET) and method of making same

  • US 8,796,733 B2
  • Filed: 08/09/2011
  • Issued: 08/05/2014
  • Est. Priority Date: 08/09/2010
  • Status: Active Grant
First Claim
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1. A tunnel field-effect transistor comprising:

  • a p-n tunnel junction comprising;

    a source-layer comprising a source-tunneling-region;

    a drain-layer comprising a drain-tunneling-region and underneath the drain-layer an air-bridge that substantially restricts electrical conduction between the drain-layer and the source-layer through the drain-tunneling-region and the source-tunneling-region; and

    a depletion region formed at the interface of the source-tunneling-region and drain-tunneling-region in which the depletion region exhibits an internal electric field that substantially points between the source-tunneling-region and drain-tunneling-region when no external electric field is imposed;

    a gate-dielectric interfaced onto the drain-tunneling-region such that the drain-tunneling-region is immediately between the source-tunneling-region and the gate-dielectric;

    a gate interfaced onto the gate-dielectric wherein the gate is configured to impose an external electric field which is oriented substantially in parallel to the internal electric field of the depletion region;

    a source-contact coupled to the source-layer; and

    a drain-contact coupled to the drain-layer.

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